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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
 
int get_value_from_response(char *dst, int len, const char *response, const char *key) {
  // make a copy of response since strtok_r modifies input
  const char kPairDelimiter[]="\n";
  char *resp = strdup(response);
  char *saveptr = NULL;
  char *line = strtok_r(resp, kPairDelimiter, &saveptr);
  size_t key_len = strlen(key);
  while (line) {
    if (!strncmp(line, key, key_len)) {
      snprintf(dst, len, "%s", line + key_len);
      free(resp);
      return 0;
    }
    line = strtok_r(nullptr, kPairDelimiter, &saveptr);
  }
  free(resp);
  return -1;
}
 
 
int main(void) {
	char resp[]="bssid=00:11:22:33:44:55\nssid=hello\npassword=world";
	char bssid[20]={0};
	size_t bssid_len = 15;
	const char kKeyBSSID[] = "bssid=";
	get_value_from_response(bssid, bssid_len, resp, kKeyBSSID);
    printf("bssid: %s", bssid);
	// your code goes here
	return 0;
}
 

prog.c: In function 'get_value_from_response':
prog.c:9:16: warning: implicit declaration of function 'strdup' [-Wimplicit-function-declaration]
   char *resp = strdup(response);
                ^
prog.c:9:16: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
prog.c:11:16: warning: implicit declaration of function 'strtok_r' [-Wimplicit-function-declaration]
   char *line = strtok_r(resp, kPairDelimiter, &saveptr);
                ^
prog.c:11:16: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
prog.c:19:21: error: 'nullptr' undeclared (first use in this function)
     line = strtok_r(nullptr, kPairDelimiter, &saveptr);
                     ^
prog.c:19:21: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty